TABLE OF CONTENTS FOREWORD... 2 INTRODUCTION SCOPE NORMATIVE REFERENCES DEFINITIONS AND ABBREVIATIONS... 3

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1 TITLE SPECIFICATION FOR MEDIUM VOLTAGE DATE: FEBRUARY 2015 PAGE: 1 OF 25 TABLE OF CONTENTS Page FOREWORD... 2 INTRODUCTION SCOPE NORMATIVE S DEFINITIONS AND ABBIATIONS REQUIREMENTS General Physical Characteristics Electrical Characteristics TESTS LABELING AND PACKAGING DOCUMENTATION QUALITY ASSURANCE... 8 Annex A - Drawings Annex B - Bibliography Annex C Revision Information Annex D Technical Schedules Annex E Stock Items. 25

2 PAGE 2 OF 25 FOREWORD Recommendations for corrections, additions or deletions should be addressed to the: Technology Services General Manager City Power Johannesburg (Pty) Ltd P O Box Booysens 2016

3 PAGE 3 OF 25 INTRODUCTION The effect of a medium-voltage loss of supply is generally severe in terms of customer inconvenience as well as repair cost to City Power. Fuses are used to timeously interrupt supply before damage can be done to medium voltage equipment. It is therefore important to ensure that MV equipment, such as fuses, complies with the required specifications and is of acceptable quality. 1 SCOPE This specification covers City Power s requirements for medium voltage fuses in accordance with international and local specifications. 2 NORMATIVE S The following documents contain provisions that, through reference in the text, constitute requirements of this specification. At the time of publication, the editions indicated were valid. All standards and specifications are subject to revision, and parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents listed below. SANS : Current-limiting fuses for high voltage. SANS : High voltage Expulsion fuses NRS 035-1: Drop-out fuses link assemblies or solid link assemblies pole-mounted NRS 035-2: Expulsion fuse-links BS 2692:- Specification for current limiting fuses 3 DEFINITIONS AND ABBIATIONS The definitions and abbreviations in the above documents shall apply to this specification. 4 REQUIREMENTS 4.1 General Drop-out fuse-link assemblies or solid link assemblies - pole mounted types A complete sample of the cut-out being offered and if fuse links are also required, copies of the fuse element s characteristics curves shall be submitted with the tender to City Power The cut-out shall be designed to allow full interchangeability of the cut-out base, the fusecarrier and the fuse-link, both between units of the same manufacturer and between units of the different manufacturer The insulator material for the cut-out base shall be polymeric. Porcelain insulators shall not be accepted The fuse-link assembly shall conform to the limiting dimensions given in figures 1 to Water shall not be able to accumulate on any part of the equipment nor shall any feature introduce moisture into any component.

4 PAGE 4 OF The design shall incorporate all reasonable precautions and provision for the safety of City Power personnel concerned with the operation and maintenance of the cut-outs All electrical components of a cut-out shall comply with the rated requirements specified in schedule A of NRS Load current path shall be arranged to flow only through high conductivity materials such as copper and its alloys, e.g. brass, phosphor or bronze aluminum. Load current shall not be permitted to flow through ferrous components, springs or spring-load mechanisms The design shall feature current paths that have a minimum number of joints and current transfer points as per NRS Fuse-carriers and solid links shall have eyes at both ends and an operating tongue (see figure 9) at the top end, to facilitate their opening, closing, removal and installation using an insulated operating stick Insulator profile characteristics shall comply with the guidelines of annex D of SANS An integral nut and washer (or integral bolt and washer) as indicated in figure 6, shall be provided to secure the tail of the expulsion fuse link to the fuse carrier The nuts and bolts of the conductor clamps shall be hot dipped galvanized steel. In order to prevent galling (i.e. seizing), fasteners made of stainless steel, aluminium, titanium or other alloys that naturally form an oxide film shall not be used Load buster hooks, see figure 1 and 2, shall be provided at the upper contact arrangement of off-load cut-outs to facilitate the use of portable load-break tools. Those hooks shall also serve as a guide bracket, i.e. to guide the fuse-carrier or the solid link into the correct position on closing MV current limiting fuse links for use in oil insulated switchgear The MV fuse-links required in this specification shall be equipped with a pyrotechnic striker pin suitable for use in MV oil-insulated switchgear applications. The fuses shall comply with the oil tightness test in accordance with SANS Full particulars including drawings, characteristics of the fuse-links ( class, switching voltages, time-current characteristics, cut-off characteristics, I 2 t characteristic, striker characteristics as well as test certificates of a recognized testing authority approved by City Power must be submitted with the tender. 4.2 Physical Characteristics Markings Each fuse shall be legibly and indelibly marked in accordance with paragraph 19 of IEC The following information shall be indelibly printed or stamped on each fuse: a) name of manufacturer b) rating and identification code of fuse c) specification with which the fuse complies d) recognised marks of approval Striker pin The striker pin shall be of the pyrotechnic type and shall provide the maximum actual travel in terms of Table 12 of SANS The fuse-link shall be marked with the direction of installation required for correct striker operation. This mark shall be indelibly printed or stamped. Adhesive labels are not acceptable.

5 PAGE 5 OF Dimensions Fuses shall match the dimensions shown below: Fuse Description Fuse 11 kv DIN type for use in air mm long with an end cap length of 34 mm and an end cap diameter of 45 mm, with striker. Fuse 11kV DIN type for use in air - 292mm long with an end cap length of 34 mm, end cap diameter of 45mm, with striker. Fuse 11kV for use in air/oil- 359mm long with an end cap diameter of 64 mm, with striker. Fuse 11kV for use in air/oil- 254mm long with an end cap diameter of 68 mm, with striker. Fuse 11kV for use in VT- 195mm long without striker. Fuse 11kV expulsion- 533mm length Dimension as per BS 2692 Part 2 Dimensions (mm) mm long with an end cap length of 34 mm and an end cap diameter of 45 mm - 292mm long with an end cap length of 34 mm and an end cap diameter of 45 mm FO2 FO1 359mm long with an end cap diameter of 64mm 254mm long with an end cap diameter of 68 mm - 195mm long - 533mm long Table 1 Fuse dimensions Note: No DIN type fuse with indentations, grooves or any other physical anomaly on the end cap shall be deemed acceptable. This is due to problems experienced with the insertion and removal of these fuses in certain types of switchgear on the City Power network. 4.3 Electrical Characteristics Time delay characteristics Fuses must have time delay capabilities in order to allow for transformer inrush currents and motor starting Curves The tenderer shall submit current-time characteristic curves for the fuses Breaking capacity and current ratings By design fuses have breaking capacities in excess of any fault condition likely to be found in service. All fuses shall be of the high rupturing capacity (HRC) type. Breaking capacity shall be 40kA.

6 PAGE 6 OF 25 Fuse Description Fuse 11 kv DIN type for use in air mm long with an end cap length of 34 mm and an end cap diameter of 45 mm, with striker. Fuse 11kV DIN type for use in air mm long with an end cap length of 34 mm and an end cap diameter of 45 mm, with striker. Fuse 11kV for use in air/oil- 359mm long with an end cap diameter of 68 mm, with striker. Fuse 11kV for use in air/oil- 254mm long with an end cap diameter of 68 mm, with striker. Fuse 11kV for use in VT-195mm long without striker. Fuse 11kV expulsion- 533mm length Current Rating (A) , , , , Table 2 Fuse current ratings 5 Tests 5.1 Type tests The following type test shall be carried out as per SANS Power frequency wet withstand test Breaking capacity test Lightning impulse test Temperature rise test Mechanical strength (endurance) test on the cut-out base and fuse-carrier Insulator ageing test Load-break test Short-time current withstand test. 5.2 Routine tests The following routine tests shall be performed as per SANS Verification of dimension.

7 PAGE 7 OF Mechanical operational test General inspection Resistance test. 6 Labeling and packaging 6.1 Packaging shall prevent damage or deterioration of the product during transport, handling and storage. 6.2 The box shall be labelled with the contract number, City Power SAP number, supplier name, and basic circuit breaker details.

8 PAGE 8 OF 25 7 Documentation 7.1 Full technical and descriptive details, relating to all the items offered in this enquiry, shall be submitted so the offer can be fully evaluated. 7.2 The information shall include: a) Products catalogue b) Name of the manufacturer c) Relevant type test certificates d) Contact of the supplier 8 Quality Assurance A quality management system shall be set up in order to assure the quality of the MV fuses during design, development, production, installation and maintenance. Guidance on the requirements for a quality management system may be found in the following standards: SANS (or SABS ISO) 9000, 9001 and The details shall be subject to agreement between the purchaser and supplier. 9 Environmental Management An environmental management plan shall be set up in order to assure the proper environmental management of the MV Fuses throughout their entire life cycle (i.e. during design, development, production, installation, operation and maintenance, decommissioning and disposal phases).guidance on the requirements for an environmental management system may be found in ISO standards. The details shall be subject to agreement between City Power and the Supplier. This is to ensure that the asset created conforms to environmental standards and City Power SHEQ Policy.

9 PAGE 9 OF 25 Annex A - Drawings NOTE: FOR CRITICAL DIMENSIONS OF INDIVIDUAL ITEMS, REFER TO THE DETAILED ITEM DRAWINGS IN FIGURES 2 TO 9 Figure 1 Cut-out assembly

10 PAGE 10 OF 25 Figure 2 Fuse-carrier details

11 PAGE 11 OF 25 Figure 3 - Solid-link detail

12 PAGE 12 OF 25 Figure 4 Fuse-carrier and solid-link upper contact (dome nut) details

13 PAGE 13 OF 25 Figure 5 Fuse-carrier and solid-link lower contact (cam) details

14 PAGE 14 OF 25 Figure 6 Fuse-carrier and solid-link lower contact (trunnion) details

15 PAGE 15 OF 25 Figure 7 Cut-out base lower contact (hinger) details

16 PAGE 16 OF 25 Figure 8 Insulator fixing stem

17 PAGE 17 OF 25 Figure 9 Typical dimensions of the operating tongue

18 PAGE 18 OF 25 Figure 10 Typical cut-out base upper contact arrangement

19 PAGE 19 OF 25 Figure 11 Typical L-bracket for wooden cross-arm

20 PAGE 20 OF 25 Figure 12- Typical L-bracket for steel cross-arm

21 PAGE 21 OF 25 Annex B - Bibliography Technical specification 139: City Power Johannesburg specification for MV fuses. Specification for Fuses and Fuse elements: City of Tshwane. Outdoor, pole-mounted, Distribution cut-outs with Fuse-link or Solid-link assemblies for nominal A.C voltages of 22 kv and 33 kv: Eskom

22 PAGE 22 OF 25 Annex C - Revision information DATE. NO. NOTES May First issue May Addition of: Note: No DIN type fuse with indentations, grooves or any other physical anomaly on the end cap shall be deemed acceptable. This is due to problems experienced with the insertion and removal of these fuses in certain types of switchgear on the City Power network. Addition of SAP A fuse for RMU Addition of SAP A VT fuse as used in BMK Addition of SAP A expulsion fuse Addition of section 8 Quality Assurance Jan Update of format March Addition of SAP 6454 FUSE CUT OUT ASSEMBLY 22KV as described in 4.4 Inclusion of paragraph Inclusion of paragraph Inclusion of clause Inclusion of Annex A: Drawings Inclusion of Environmental Management Annex B, edited.

23 PAGE 23 OF 25 Annex D - Technical schedules A and B Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of equipment offered Item Subclause of CP_TSSPEC_070 Description Schedule A Schedule B 1 N/A System operating voltage 11 kv Required Marking requirements Required Certified copy of type test to be provided with tender documentation 4 7 Catalogue to be provided with tender Documentation Required Required Tender Number: Tenderer s Authorised Signatory: Name in block letters Signature Full name of company:

24 PAGE 24 OF 25 Technical schedules A and B Deviation schedule Any deviations offered to this specification shall be listed below with reasons for deviation. In addition, evidence shall be provided that the proposed deviation will at least be more costeffective than that specified by City Power. Item Subclause of CP_TSSPEC_070 Proposed deviation Tender Number: Tenderer s Authorised Signatory: Name in block letters Signature Full name of company:

25 PAGE 25 OF 25 Annex E Stock Items Material Group : MV Ite SAP SAP Short Description FUSE 11 KV 200A DIN IN AIR 442 MM WS FUSE 11 KV 80A DIN IN AIR 442 MM WS FUSE 11 KV 80A DIN IN AIR 292 MM WS FUSE 11KV 31.5 A DIN IN AIR 292 MM WS FUSE 11KV 80 A IN AIR/OIL- 359MM WS SAP Long Description FUSE 11 KV 200 A DIN TYPE FOR USE IN AIR MM LONG WITH AN END CAP LENGTH OF 34 MM AND AN END CAP DIAMETER OF 45 MM WITH STRIKER CP_TSSPEC_070 FUSE 11 KV 80 A DIN TYPE FOR USE IN AIR MM LONG WITH AN END CAP LENGTH OF 34 MM AND AN END CAP DIAMETER OF 45 MM WITH STRIKER CP_TSSPEC_070 FUSE 11KV 80 A DIN TYPE FOR USE IN AIR MM LONG WITH AN END CAP LENGTH OF 34 MM AND AN END CAP DIAMETER OF 45 MM WITH STRIKER CP_TSSPEC_070 FUSE 11KV 31.5 A DIN TYPE FOR USE IN AIR MM LONG WITH AN END CAP LENGTH OF 34 MM AND AN END CAP DIAMETER OF 45 MM WITH STRIKER CP_TSSPEC_070 FUSE 11KV 80 A FOR USE IN AIR/OIL- 359MM LONG WITH AN END CAP DIAMETER OF 68 MM WITH STRIKER CP_TSSPEC_ FUSE 11KV 31.5 A IN AIR/OIL- 359MM WS FUSE 11KV 31.5 A FOR USE IN AIR/OIL- 359MM LONG WITH AN END CAP DIAMETER OF 68 MM WITH STRIKER CP_TSSPEC_ FUSE 11KV 80 A IN AIR/OIL- 254MM WS FUSE 11KV 80 A FOR USE IN AIR/OIL- 254MM LONG WITH AN END CAP DIAMETER OF 68 MM WITH STRIKER CP_TSSPEC_ FUSE 11KV 31.5 A IN AIR/OIL- 254MM WS FUSE 11KV FOR USE IN AIR/OIL A 254MM LONG WITH AN END CAP DIAMETER OF 68 MM WITH STRIKER CP_TSSPEC_ FUSE 11KV 1A FOR VT- 195MM FUSE 11KV 3A FOR VT- 195MM FUSE 11KV EXPULSION 5A 533MM LENGTH FUSE 11KV EXPULSION 10A 533MM LENGTH FUSE 11KV EXPULSION 15A 533MM LENGTH FUSE 11KV EXPULSION 25A 533MM LENGTH FUSE 11KV EXPULSION 30A 533MM LENGTH FUSE 11KV EXPULSION 40A 533MM LENGTH FUSE CUT OUT ASSEMBLY 22KV FUSE 11KV FOR USE IN VT-1A 195MM LONG WITH AN END CAP DIAMETER OF 20 MM NO STRIKER CP_TSSPEC_070 FUSE 11KV FOR USE IN VT-3A 195MM LONG WITH AN END CAP DIAMETER OF 20 MM NO STRIKER CP_TSSPEC_070 FUSE 11KV EXPULSION 5A 533MM LENGTH CP_TSSPEC_070 FUSE 11KV EXPULSION 10A 533MM LENGTH CP_TSSPEC_070 FUSE 11KV EXPULSION 15A 533MM LENGTH CP_TSSPEC_070 FUSE 11KV EXPULSION 25A 533MM LENGTH CP_TSSPEC_070 FUSE 11KV EXPULSION 30A 533MM LENGTH CP_TSSPEC_070 FUSE 11KV EXPULSION 40A 533MM LENGTH CP_TSSPEC_070 FUSE CUT OUT ASSEMBLY 22KV COMPLETE CP_TSSPEC_070